STEM EVIDENCE WORKBENCH
Check calculated measurement reports against operation-specific significant-figure and decimal-place rules while preserving entered notation.
Review output
Load the worked example to inspect realistic inputs, or enter anonymous classroom or laboratory evidence. Results remain in this browser tab until you copy or download them.
Transparent method
For multiplication or division, round the final value to the smallest significant-figure count among the operands. For addition or subtraction, round to the smallest decimal-place count. The engine calculates first, then formats once. Leading zeros are not significant; entered trailing zeros after a decimal point are significant. A full match means both numerical value and displayed precision agree with the selected rule. A numeric-only match means the value is equivalent but its written trailing-zero evidence differs. A review flag should lead to inspection of exact quantities, uncertainty, course conventions, and whether scientific notation would communicate precision more clearly.
Confirm the prompt, source values, units, signs, notation, precision, and model required by the current course. Keep an untouched copy of observations or responses before changing a row.
Run the worked example first, inspect every intermediate row, and compare the table with a hand calculation, diagram, graph, periodic table, or approved laboratory method.
Record the method, assumptions, units, rounding, limits, and any row that needs review. Use the exported report as editable evidence and verify it independently before assessment or laboratory use.
How to interpret the result
Use when reviewing how measured quantities are reported after arithmetic. It distinguishes the multiplication and division significant-figure rule from the addition and subtraction decimal-place rule. It does not know whether an operand is an exact count, defined conversion, uncertainty interval, or value governed by a different laboratory policy.
The example rounds 12.3 times 4.56 to three significant figures, reporting 56.1. It reports 25.0 divided by 4.2 as 6.0 to two significant figures. It rounds 12.35 plus 0.7 to one decimal place. A subtraction entered with too many decimal places is retained and flagged beside the unrounded value.
For multiplication or division, round the final value to the smallest significant-figure count among the operands. For addition or subtraction, round to the smallest decimal-place count. The engine calculates first, then formats once. Leading zeros are not significant; entered trailing zeros after a decimal point are significant.
A full match means both numerical value and displayed precision agree with the selected rule. A numeric-only match means the value is equivalent but its written trailing-zero evidence differs. A review flag should lead to inspection of exact quantities, uncertainty, course conventions, and whether scientific notation would communicate precision more clearly.
Do not apply decimal places to multiplication, count leading zeros as significant, remove a meaningful final zero, round every intermediate step, infer precision that the source never recorded, or treat significant figures as a complete uncertainty analysis. Preserve the original measurements and use the laboratory reporting policy.
Learning boundary
This browser-local workbench applies only the disclosed rules to entered values. It cannot diagnose learning, certify an experiment, establish a chemical fact, reconstruct missing evidence, or replace the method and judgment required by a teacher, curriculum, laboratory, or institution.
Review checklist
Practical questions
No. Processing occurs in the current browser tab. Avoid names and other personal information, and retain authoritative records only in the system approved by the school.
No. A matched pattern describes the entered evidence under one disclosed rule. Ask for an explanation and review several evidence sources before deciding the next step.
Treat it as an editable calculation aid. Show your own reasoning, use the method requested by the course, cite required sources, and follow the applicable academic-integrity rules.
YOUR NIRMION
